 /*******************************************************************************
  * Copyright (c) 2005, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.wizards.preferences;

 import java.io.File ;
 import java.io.FileNotFoundException ;
 import java.io.FileOutputStream ;
 import java.io.IOException ;

 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.core.runtime.preferences.IEclipsePreferences;
 import org.eclipse.core.runtime.preferences.IPreferenceFilter;
 import org.eclipse.core.runtime.preferences.IPreferencesService;
 import org.eclipse.jface.dialogs.MessageDialog;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.ui.internal.WorkbenchPlugin;
 import org.eclipse.ui.internal.preferences.PreferenceTransferElement;

 /**
  * Page 1 of the base preference export Wizard
  *
  * @since 3.1
  */
 public class WizardPreferencesExportPage1 extends WizardPreferencesPage {

     // constants
 private static final String PREFERENCESEXPORTPAGE1 = "preferencesExportPage1"; // //$NON-NLS-1$

     /**
      * Create an instance of this class
      */
     protected WizardPreferencesExportPage1(String name) {
         super(name);
         setTitle(PreferencesMessages.WizardPreferencesExportPage1_exportTitle);
         setDescription(PreferencesMessages.WizardPreferencesExportPage1_exportDescription);
     }

     /**
      * Create an instance of this class
      */
     public WizardPreferencesExportPage1() {
         this(PREFERENCESEXPORTPAGE1);
     }

     protected String getOutputSuffix() {
         return ".epf"; //$NON-NLS-1$
 }
     
     /**
      * Answer the contents of self's destination specification widget
      *
      * @return java.lang.String
      */
     protected String getDestinationValue() {
         String idealSuffix = getOutputSuffix();
         String destinationText = super.getDestinationValue();

         // only append a suffix if the destination doesn't already have a . in
 // its last path segment.
 // Also prevent the user from selecting a directory. Allowing this will
 // create a ".epf" file in the directory
 if (destinationText.length() != 0
                 && !destinationText.endsWith(File.separator)) {
             int dotIndex = destinationText.lastIndexOf('.');
             if (dotIndex != -1) {
                 // the last path seperator index
 int pathSepIndex = destinationText.lastIndexOf(File.separator);
                 if (pathSepIndex != -1 && dotIndex < pathSepIndex) {
                     destinationText += idealSuffix;
                 }
             } else {
                 destinationText += idealSuffix;
             }
         }

         return destinationText;
     }

         
     protected String getAllButtonText() {
         return PreferencesMessages.WizardPreferencesExportPage1_all;
     }

     protected String getChooseButtonText() {
         return PreferencesMessages.WizardPreferencesExportPage1_choose;
     }

     /**
      * @param composite
      */
     protected void createTransferArea(Composite composite) {
         createTransfersList(composite);
         createDestinationGroup(composite);
         createOptionsGroup(composite);
     }

     /**
      * Answer the string to display in self as the destination type
      *
      * @return java.lang.String
      */
     protected String getDestinationLabel() {
         return PreferencesMessages.WizardPreferencesExportPage1_file;
     }

     /*
      * return the PreferenceTransgerElements specified
      */
     protected PreferenceTransferElement[] getTransfers() {
         PreferenceTransferElement[] elements = super.getTransfers();
         PreferenceTransferElement[] returnElements = new PreferenceTransferElement[elements.length];
         IPreferenceFilter[] filters = new IPreferenceFilter[1];
         IPreferenceFilter[] matches;
         IPreferencesService service = Platform.getPreferencesService();
         int count = 0;
         try {
             for (int i = 0; i < elements.length; i++) {
                 PreferenceTransferElement element = elements[i];
                 filters[0] = element.getFilter();
                 matches = service.matches((IEclipsePreferences) service
                         .getRootNode().node("instance"), filters); //$NON-NLS-1$
 if (matches.length > 0) {
                     returnElements[count++] = element;
                 }
             }
             elements = new PreferenceTransferElement[count];
             System.arraycopy(returnElements, 0, elements, 0, count);
         } catch (CoreException e) {
             WorkbenchPlugin.log(e.getMessage(), e);
             return new PreferenceTransferElement[0];
         }
         return elements;
     }

     /**
      * @param transfers
      * @return <code>true</code> if the transfer was succesful, and
      * <code>false</code> otherwise
      */
     protected boolean transfer(IPreferenceFilter[] transfers) {
         File exportFile = new File (getDestinationValue());
         if (!ensureTargetIsValid(exportFile)) {
             return false;
         }
         FileOutputStream fos = null;
         try {
             if (transfers.length > 0) {
                 try {
                     fos = new FileOutputStream (exportFile);
                 } catch (FileNotFoundException e) {
                     WorkbenchPlugin.log(e.getMessage(), e);
                     MessageDialog.openError(getControl().getShell(), new String (), e.getLocalizedMessage());
                     return false;
                 }
                 IPreferencesService service = Platform.getPreferencesService();
                 try {
                     service.exportPreferences(service.getRootNode(), transfers,
                             fos);
                 } catch (CoreException e) {
                     WorkbenchPlugin.log(e.getMessage(), e);
                     MessageDialog.openError(getControl().getShell(), new String (), e.getLocalizedMessage());
                     return false;
                 }
             }
         } finally {
             if (fos != null) {
                 try {
                     fos.close();
                 } catch (IOException e) {
                     WorkbenchPlugin.log(e.getMessage(), e);
                     MessageDialog.openError(getControl().getShell(), new String (), e.getLocalizedMessage());
                     return false;
                 }
             }
         }
         return true;
     }

     protected String getFileDialogTitle() {
         return PreferencesMessages.WizardPreferencesExportPage1_title;
     }

     protected int getFileDialogStyle() {
         return SWT.SAVE;
     }
     
     /* (non-Javadoc)
      * @see org.eclipse.ui.internal.wizards.preferences.WizardPreferencesPage#getInvalidDestinationMessage()
      */
     protected String getInvalidDestinationMessage() {
         return PreferencesMessages.WizardPreferencesExportPage1_noPrefFile;
     }
 }

